This document is a letter of recommendation for Sarah Zimmerdahl Josefsen from her supervisor Peter B. Vahlstrup. It states that Sarah worked as a teaching assistant for a course on digital representations, where she facilitated group sessions, a study club, and graded assignments. It also notes that she previously worked for two semesters for Peter's colleague, who recommended her for her professional competencies and commitment. Peter recommends Sarah highly for her independence, overview, communication skills, and professionalism.